1. Department d'Enginyeria Mecànica, Universitat Rovira i Virgili, Av. Països Catalans 26, Tarragona 43007,
Spain
2. Mechanical and Aerospace Engineering, Utah State University, 4130 Old Main Hill, Logan, Utah 84322-4130,
USA
3. Department of Mechanical Science and Engineering, University of Illinois at Urbana-Champaign, 1206 W. Green St. MC 244, Urbana,
Illinois 61801, USA